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Holcim South Platte Combined SWSP September 18, 2025 <br /> Plan IDs 3614, 4773, 3624, 4772, 4616, 3437, 3376, 3650, 3668, 5475, 5829, &t 6243 Page 6 of 37 <br /> ensure the pond does not spill. There was a temporary cessation of <br /> dewatering in January 2018. The site will no longer be dewatered starting <br /> in 2025. <br /> Exposed Groundwater Surface: 17.0 acres <br /> Active Dewatering: Yes, until it is lined during this plan period. <br /> Platte Valley Status: Mining operations at the Platte Valley Pit are not anticipated to <br /> Pit occur in 2025, though reclamation activity consisting of backfilling <br /> portions of the site will continue in 2025. Holcim intends to import <br /> (South Platte 1,354,800 tons of material mined at other sites to the Platte Valley Pit <br /> Mainstem) site for processing. The imported material will be washed with water <br /> withdrawn from exposed groundwater ponds on the site, therefore 2% of <br /> the weight of the imported material will be charged as a depletion. The <br /> initial moisture content of the material will be charged as depletions at <br /> the originating source, which may include sources operated by other <br /> entities. Depletions covered by this SWSP include water lost due to <br /> evaporation, aggregate processing, dust control, and concrete batching. <br /> Water for concrete batching will come from Well Permit No. 13410-F-R <br /> (WDID 0207073). Note that the water right for this well was on the <br /> division engineer's 2010 Decennial Abandonment List, but the well may <br /> still be used in accordance with its permit as long as all depletions are <br /> treated as junior to all other vested water rights in accordance with this <br /> SWSP and the well complies with the South Platte Well Measurement <br /> Rules. The Applicant submitted the attached "Figure 1— Platte Valley Pit <br /> 2021 Exposed Area" for verification of the area that has been exposed <br /> starting in 2019. <br /> Exposed Groundwater Surface: 56.0 acres <br /> Active Dewatering: No <br /> DPG Pit Status: Mining operations are anticipated to continue at the DPG Pit in <br /> (South Platte 2025. Water use at this site will consist of evaporation from exposed <br /> Mainstem) groundwater, aggregate production, and dust control. <br /> Exposed Groundwater Surface: 16.0 <br /> Active Dewatering: Yes <br /> Distel Pit Status: Mining operations at the Distel Pit were completed in 2011 and <br /> reclamation is in progress. In 2017, Holcim used water from the Distel site <br /> (St. Vrain as a water supply for a portable ready-mixed plant located at the site for <br />